The onboard charger is going from 240 VAC to pack level. That's a somewhat secondary use case in terms of peak load, and has nothing to do with getting up to sp

The onboard charger is going from 240 VAC to pack level. That's a somewhat secondary use case in terms of peak load, and has nothing to do with getting up to speed or regeneration, so they don't spend much resources on it. The main inverter is going between motor voltage and pack voltage, and depending on the car can handle regeneration at upwards of 60 kW (Teslas) to 265 kW (Porsche Taycan). The cable that is putting 30 kW into the battery? It's the same one that's designed to conduct 80-110 kW from battery to motor in your Leaf.